A oes unrhyw enghreifftiau rhyngwladol o gynlluniau dychwelyd ernes sydd wedi wynebu heriau neu aneffeithlonrwydd sy'n gysylltiedig â chynnwys gwydr ac, os felly, pa wersi y mae Llywodraeth Cymru wedi'u dysgu o'r profiadau hyn?
Any complex project can face challenges or inefficiencies, however, over more than a century Deposit Return Schemes (DRS) including glass have operated in countries around the world, including the UK. There are many successful international examples, the vast majority of which include glass as standard. We have learned from international best practice such as schemes in Finland, Estonia, Denmark, Lithuania, the US, Canada and Australia. The greatest challenge and inefficiency faced is the wastage in energy and materials caused by unnecessary disposal, which a DRS will help to address.